Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie a soma de Long para jardas menores que 197 e jogadores de Matt Nagy.
 ###Tabelas: CREATE TABLE writing_system (writing_system_id AUTO_INCREMENT PRIMARY KEY, А а [a] VARCHAR, Б б [b] VARCHAR, В в [v] VARCHAR, Г г [ɡ] VARCHAR, Гь гь [ɡʲ] VARCHAR, Гә гә [ɡʷ] VARCHAR, Ҕ ҕ [ʁ/ɣ] VARCHAR, Ҕь ҕь [ʁʲ/ɣʲ] VARCHAR) CREATE TABLE list_of_players (list_of_players_id AUTO_INCREMENT PRIMARY KEY, Nationality VARCHAR, Position [A ] VARCHAR, Milan career VARCHAR, Captaincy VARCHAR, Appearances INT, Goals INT) CREATE TABLE running_backs (running_backs_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Car. INT, Yards INT, Avg. INT, TD's INT, Long INT) CREATE TABLE topographical_survey (topographical_survey_id AUTO_INCREMENT PRIMARY KEY, Name of Village VARCHAR, Name in Syriac VARCHAR, Number of Believers INT, Number of Priests INT, Number of Churches INT) CREATE TABLE comparison_chart (comparison_chart_id AUTO_INCREMENT PRIMARY KEY, Project VARCHAR, License VARCHAR, Date VARCHAR, Protocol VARCHAR, Technology VARCHAR, Server VARCHAR, Client VARCHAR, Web Client VARCHAR, Multiple Sessions VARCHAR, Encryption VARCHAR, Authentication VARCHAR, Data Compression VARCHAR, Image Quality VARCHAR, Color Quality VARCHAR, File Transfer VARCHAR, Clipboard Transfer VARCHAR, Chat VARCHAR, Relay VARCHAR, HTTP Tunnel VARCHAR, Proxy VARCHAR)  
SELECT SUM Long FROM running_backs WHERE Yards < 197 AND Player = matt nagy